Client Side from a button in the footer/header

Oren

1. I have a listbox with checkboxes items.
lets say i have added a header template and inside i put a button and call it "CheckAll".
From the client side (JS) i would like to click on the button and then to check all the items, another click on the same button will uncheck all the items.
It is very important to me do it from a button in the header of the listbox and not from a checkbox named "All" like in your demo
whether it's a problem to do it from a button in the header, how to do it from a button out of the listbox controll?

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